frame skip?

Im used to using GoPro Cine Studios so to slow down all I did was divide 2 to slow the speed down
However now I'm using Adobe Premiere CC, so I put the speed to 20 percent. I usually do that in CineStudios and that never happens.
What am I doing wrong?

Also if you are animating by expanding the video track and selecting motion | Twixtor Output: Speed to show up as a curve, try a non linear interpolator (It defaults to linear). You can access the curve types by right-mouse clicking on a keyframe. Make sure the curve does not go backward though which is easy to do if you look at it real small...